1Plugge W, Van Der Vlies C. Near - infrared spectroscopy as an alternative to assess compliance of ampicillin trihydrate with compendial specifications. J Pharm Biomed Anal, 1993,11 (6) :435.
2Ritchie GE, Mark H, Ciurczak EW. Evaluation of the conformity index and the Mahalanobis distance as a tool for process analysis : a technical note. AAPS Pharm Sci Tech ,2003 , 4 ( 2 ) :E24.
3Gemperline PJ, Boyer NR. Classification of near - infrared spectra using wavelength distances:comparison to the mahalanobis distance and residual variance methods. Anal Chem, 1995,67 ( 1 ) : 160.